strong



2 Sheets-Sheet 1.

(No ModeL) G. S. STRONG.

VALVE GEAR.

Patented Apr. 14, 1885,

2 Sheets-Sheet 2.

(No Modem G. s. STRONG.

VALVE GEAR.

m Patented Apr. 14, 1885.

Il PETERS. Fvewumugmpw. wasmngwn 11C.

UNITED STATES,

PATENT Ottica.

GEORGE S. STRONG, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO JOHN T. MORRIS, TRUSTEE, OF SAME PLACE.

VALVE-GEAR.

SPECIFICATION forming part of Letters Patent No. 315,972, dated April 14, 1885.

Application iiled June 16, 1884. (No model.)

T 0 @ZZ wiz/0mzt may concern,.-

Be it known that I, GEORGE S. STRONG, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Valve-Gear for Steam-Engines, of which the following is aspecification.

My invention consists ol" mechanism, described and claimed hereinafter, by which the valve of a steam-engine may be operated from the crank-shaft or axle and connecting-rod, the movement obtained being essentially the same as that obtained by devices which form the subjects of my applications for Patents No. 118,216, filed January 21, 1884, allowed April 11, 1884, and No. 118, 025, tiled January 19, 1884, allowed May 81, 1881.

In the accompanying drawings, Figure 1, Sheet 1, is a side view of my improved valvegear applied to alocornotive-engine, Fig. 2, a plan View; Fig. 8, a modification of part of Fig. 1, and Fig. 4, Sheet 2, a view representing a modiiieation of my invention.

Referring to Figs. l and 2, A is a connectingrod of the engine; l?, the axle of the driving-wheel P', and Q the crank-pin to which the end of the rod Ais adapted. is secured a return-crank, R, one end of a rod, S, being connected to the pin of this crank, and the other end, by a pin, c, to a link, K, which is connected by a pin, m, to the rod A.

The lower end of a lever, H, is connected to the link K, the upper end of the lever being connected by the i'ulerurn-pin d to one end of a rod, F, the opposite end of which is connected to a block, E, adapted to asegrnent, D, permanently secured to any part of the frame ofthe engine, the block being adjustable on the segment and being connected by any suitable systern of rods and levers to the stopping, starting, and reversing lever of the engine.

The short arm b of the lever His connected by a pin, d', to a rod, G, which is hinged to the valve-rod B.

Referring to the application for a patent tiled by me January 21,1884,Serial No. 118,216, it will be seen that part of the above-described valve-motion is substantially the same as th at shown in Figs. 8 and 9, Sheet 3, of the said application, and referred to but not claimed in the specification ,the result of the motion on To this pin the valve, which may be an ordinary slidevalve, being also the same, the pin d traversing in a course indicated by the diagram, Fig. 6, Sheet 4, of the said application, and bythe diagram, Fig. 7 ,in the drawings connected with the application for apatent led by me J annary 19, 1884, Serial No. 118,025. The only difference between the valve-motion shown in Fig. 1 and that shown in Fig. 3 is that in the latter the rod S is connected to the link K by the same pin, b,which connects the said link to the lever H, Whereas in Fig. 1 the lever is connected to the link at apoint between the pins c and x, the result in both cases being the same if the throw of the pin of the return-crank be properly proportioned, the throw in Fig. 1 being indicated by the dotted circle w, and the radius of this circle being equal to the distance between the dotted line t t, representing the center line of the lever H when the piston is at half-stroke, and the pin c when the piston is at the end of its stroke, the same rule being observed in the modification, Fig. 4, where the radius of the dotted circle/w', representing the throw of the pin ofthe return-crank, is equal to the distance between the said line t 1. and the pin b.

In cases where no cut-off is required the valve-rod B may be connected directly to the pin d ofthe lever H, as shown in Fig. 3, and as also shown in my said application No. 118,025, liled January 19, 1881, and allowed May 31, 1884.

The xed segment D is an important element of the combination claimed hereinafter, as it eftectuallyresists the backlash due to the reciprocation ofthe valve.

It should be understood that I do not claim, broadly, the operating of a valve from the connecting-rod A and the pin of a return-crank on the crank-pin of an engine. The fixed segment, lever H, rods G and F, and valve-rod B, being shown in my aforesaid applications for patents, are also hereby disclaimed; but

I claim as my invention- 1. The combination, in a valve -gear for steam engines, of the following elements, namely: rst, the tixed segment D, and the block adjustable thereon; second, the lever H, the connecting-rod A, link K, rod S, and return-crank R on the crank-pin of the crank- ICO 1o and having an arm, b', connected to the valvespindle; and, third, the connecting-rod A,

link K, and rod S, and the return-crank R on the crank-pin of the shaft or axle, all substantially as set forth.

In testimony whereof Ihave signed my name to this specification in the presence of two subscribing witnesses.

GEORGE S. STRONG.

Witnesses:

HARRY SMITH, HENRY HOWsoN, Jr. 

